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解剖了自然贮存14年的某型发动机,对所得推进剂进行了力学和燃烧性能测试.理论分析中建立了发动机三维内弹道和有限元模型,并根据计算流体动力学(CFD)计算边界网格和有限元模型(FEM)药柱表面网格异构但空间位置一致的特点,开发了发动机内弹道压力转化为药柱有限元载荷的算法,完成了发动机工作过程流场-结构的耦合分析,并对发动机的内弹道和药柱结构完整性进行了评估.试验表明:长期贮存后发动机中端羟基聚丁二烯(HTPB)推进剂力学性能变化体现模量增加和延伸率降低,燃烧性能也有一定变化;计算所得发动机内弹道能完成发射任务,同时发动机药柱的力学性能能保证工作期间的结构完整性,发动机基本满足使用要求.
An engine which has been stored for 14 years in nature was dissected, and the mechanical and combustion properties of the obtained propellants were tested.In the theoretical analysis, the 3D internal-ballistics and finite element model of the engine were established and the boundary meshes were calculated according to Computational Fluid Dynamics (CFD) And FEM finite element model (FEM), but the space position is consistent. The algorithm of transforming the internal ballistic pressure into the finite element load of the column was developed, and the flow field-structure coupling analysis of the engine working process was completed. And the structural integrity of the internal ballistics and the column of the engine were evaluated.The results show that the change of mechanical properties of the mid-terminal polybutadiene (HTPB) propellants after long-term storage shows the increase of modulus and the decrease of the elongation and the combustion performance The calculated internal ballistic trajectory can accomplish the launch mission. At the same time, the mechanical properties of the engine cylinder can ensure the structural integrity during operation, and the engine basically meets the requirements of operation.